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Alumina fiber integral module and preparation method thereof

A technology of alumina fiber and fiber module, which is applied in the field of alumina fiber integral module and its preparation, can solve the problems of large change of heating permanent wire, reduced thermal insulation performance and high thermal conductivity, and achieves small change of heating permanent wire and stable bulk density. , the effect of low thermal conductivity

Inactive Publication Date: 2020-06-09
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the preparation method of the above-mentioned ceramic fiber integral module, it is easy to pulverize in a high-temperature kiln above 1250 ° C, the heat insulation performance is reduced, the content of slag balls is high, the volume is large, the thermal conductivity is high, and the heating permanent line changes greatly, which cannot meet the requirements 1300℃ High Temperature Furnace Requirements

Method used

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preparation example Construction

[0024] The invention provides a method for preparing an alumina fiber integral module, comprising the following steps:

[0025] a) After mixing the polyaluminum chloride sol and the second-phase oxide, add additives to react to obtain the alumina sol; Al in the polyaluminum chloride sol 2 o 3 The content is 25wt% ~ 35wt%;

[0026] b) performing fiber formation and molding on the alumina sol obtained in step a) in sequence to obtain a shaped fiber body;

[0027] c) heat-treating the shaped fiber body obtained in step b), and assembling to obtain an alumina fiber integral module.

[0028] In the present invention, firstly, after mixing the polyaluminum chloride sol and the second-phase oxide, adding additives for reaction, the alumina sol is obtained. In the present invention, the polyaluminum chloride sol is an aluminum source; Al in the polyaluminum chloride sol 2 o 3 The content is 25wt%-35wt%, preferably 25wt%-28wt%.

[0029] In the present invention, the preparation p...

Embodiment 1

[0054] (1) Heat aluminum powder, hydrochloric acid (calculated as HCl) and distilled water at a molar ratio of 2:1:18 at 90°C to obtain Al 2 o 3 The polyaluminum chloride sol of content 25wt%, is cooled to room temperature standby;

[0055] Lactic acid, polyvinyl alcohol, alcohol and water are mixed and dissolved at room temperature according to the mass ratio of 0.5:6:0.6:90 as additives;

[0056] According to the mass ratio of alumina to the second phase oxide (silicon oxide) in the aluminum source is 80:20, add tetraethyl orthosilicate to the polyaluminum chloride sol and mix evenly, and add the solid content of alumina and silica and 5wt% additives, polymerized at 80°C for 5h to obtain alumina sol.

[0057] (2) Add the above-mentioned colloid to the spinning roller and adjust the frequency of the spinning roller to 45Hz, the fiber forming distance to 6000mm, form a fiber body with a thickness of 370mm in the cotton collector, and then put it into the drum needle loom Ca...

Embodiment 2

[0061] (1) Heat aluminum powder, hydrochloric acid (calculated as HCl) and distilled water at a molar ratio of 1.9:1:20 at 90°C to obtain Al 2 o 3 The polyaluminium chloride sol of content 28wt%, is cooled to room temperature standby;

[0062] Lactic acid, polyvinyl alcohol, alcohol and water are mixed and dissolved at room temperature according to the mass ratio of 0.3:4:0.4:85 as additives;

[0063] According to the mass ratio of alumina to the second phase oxide (silicon oxide) in the aluminum source is 75:25, add acidic silica sol to the polyaluminum chloride sol and mix evenly, and add the sum of the solid content of alumina and silica 8wt % additives, polymerized at 120°C for 2 hours to obtain alumina sol.

[0064] (2) Add the above-mentioned colloid to the spinning roller and adjust the frequency of the spinning roller to 60Hz and the fiber forming distance to 6500mm, form a fiber body with a thickness of 320mm in the cotton collector, and then put it into the drum ne...

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Abstract

The invention provides a preparation method of an alumina fiber integral module, wherein the preparation method comprises the following steps: a) mixing a polyaluminum chloride sol and a second-phaseoxide, and adding an additive to react to obtain an alumina sol, wherein the content of Al2O3 in the polyaluminium chloride sol is 25 wt%-35 wt%; b) sequentially carrying out fiber forming and moldingon the alumina sol obtained in the step a) to obtain a molded fiber blank; and c) carrying out heat treatment on the molded fiber blank obtained in the step b), and assembling to obtain the alumina fiber integral module. Compared with the prior art, the alumina fiber integral module obtained by the preparation method provided by the invention is high in use temperature, small and stable in volumeweight, low in slag ball content, small in heating permanent linear change, low in heat conductivity coefficient, excellent in airflow scouring resistance and long in service life; moreover, the preparation method is simple in process and short in period, an integral structure is directly formed, secondary processing is avoided, damage to fibers is small, and the product is excellent in heat insulation performance.

Description

technical field [0001] The invention relates to the technical field of ceramic fiber modules, and more specifically relates to an alumina fiber integral module and a preparation method thereof. Background technique [0002] The ceramic fiber module is a new refractory lining product introduced to simplify and speed up the construction of the kiln and improve the integrity of the lining. The product is white in color and regular in size, and can be directly fixed on the anchor nails of the steel plate of the industrial kiln shell. . Because the existing modules have problems such as low temperature resistance and large capacity, there is an urgent need for a new product or structure with a higher operating temperature and lower capacity. [0003] The use temperature of alumina fiber is high, the content of slag ball is low, and the change of heating permanent line is small. At present, domestic alumina fiber manufacturers mostly produce alumina in the form of alumina fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/622
CPCC04B35/62236C04B2235/3418C04B2235/3244C04B2235/3409C04B2235/3206C04B2235/483C04B2235/48C04B2235/444
Inventor 王成龙李梅傅超岳耀辉鹿明
Owner 山东鲁阳浩特高技术纤维有限公司
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